Strange face transparency artifacts in Eevee
You have an Alpha sorting issue. (Z fighting) When you have an Alpha channel in your texture the renderer has problems sorting which face is closest to the camera (or viewer).

This can be corrected if you tell the renderer to ignore Transparency or Backfaces.

First screenshot shows your present alpha Blend Mode :



You have a choice, either set the Blend Mode to Opaque :


or deselect the option Show Backface :


Third option create a new material and assign that to your model. The default settings work as is.

BTW. Your model also shows Alpha sorting issues in Cycles (and Eevee, when Viewport Shading is set to Material View.